| 摘要 |
It consists of a metallic sheet 1, particularly made from aluminium or a metal with similar characteristics, whose lateral edges are joined to the frame 2 which encloses it via various weld points, particularly weld points located on the aforesaid edges and in the hollows or depressions of the concavities or waves which form the actual sheet 11, there being longitudinal and transverse notches in the frame for better containment of the solder and securing the frame to the sheet. <IMAGE>
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